Aquarium Temperature Monitor Kit with ESP32 + LED
ESP32 Modbus RTU to TCP Bridge for Aquarium Temperature Monitoring
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Build a robust aquarium temperature monitoring system that reads industrial-grade DS18B20 sensors over RS-485 and serves the data as a fully functional Modbus TCP server. This kit turns an ESP32 into a Modbus bridge, enabling remote monitoring of your aquarium from any device on your WiFi network — exactly how automation engineers integrate field sensors into SCADA and building management systems. If you have ever wanted to move beyond simple Arduino projects and dive into real industrial IoT, this is the bridge you need.
What You'll Build
By the end of this project, you will have a working Modbus bridge that continuously reads two waterproof DS18B20 probes via a MAX485 transceiver and displays live temperatures on a crisp OLED screen. The ESP32 acts as a Modbus TCP server, exposing all sensor registers so that any Modbus master (Node-RED, custom Python script, or industrial HMI) can read the temperatures over your local network. No cloud, no subscriptions — just pure deterministic industrial protocol, exactly the way monitoring is done in professional aquaculture and HVAC systems.
What You'll Learn
- Implement Modbus RTU master communication on ESP32 with precise timing and register mapping
- Configure RS-485 physical layer using MAX485 transceiver, including biasing and termination
- Expose sensor data via Modbus TCP server, fully compliant with the Modbus Application Protocol
- Troubleshoot industrial communication faults using the onboard OLED for real-time diagnostics
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | x1 |
| MAX485 RS485 | x1 |
| DS18B20 Probe | x2 |
| 0.96in OLED | x1 |
| 120Ω Resistors | x3 |
| 10kΩ Resistors | x5 |
| 100nF Caps | x5 |
| PCB Prototype Board | x2 |
| Soldering Iron | x1 |
| Solder Wire | x1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This intermediate project is designed for CBSE Class 11–12 students pursuing computer science or electronics, B.Tech ECE/EEE undergraduates wanting hands-on experience with industrial protocols, and Smart India Hackathon teams building automation prototypes. ATL Tinkering Lab mentors will find it a powerful tool to demonstrate real-world Modbus communication beyond basic sensor tutorials, while IIT/NIT/VIT/BITS aspirants can use it to strengthen their practical project portfolio with a standard industrial skill.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
The included AI companion provides interactive debugging, register-level register checks, and Modbus frame analysis. If you still need a human, our engineers respond within hours on WhatsApp.
Do I need previous experience with Modbus or RS-485?
No. The AI guide explains every concept from signal voltage levels to function codes. The kit assumes basic familiarity with Arduino IDE and uploading code to an ESP32; everything else is taught step by step.
Can I monitor more than two temperature sensors?
Yes. The Modbus RTU bus can daisy-chain multiple DS18B20-based nodes. The ESP32 firmware is written to handle up to 32 registers, so you can easily expand to additional probes or sensors without changing the core logic.
Will this work without a WiFi router or internet connection?
The ESP32 creates its own WiFi access point in station mode, allowing you to connect a laptop or phone directly to the Modbus TCP server. No external router is needed for local monitoring; network access is required only if you want to integrate with distributed systems like Node-RED.
Aquarium — ESP32 reads Modbus RTU sensors via MAX485 and bridges all registers to Modbus TCP over Ethernet.
What's in this kit
- ESP32 Dev Board
- MAX485 RS485
- DS18B20 Probe x2
- 0.96in OLED
- 120Ω Resistors x3
- 10kΩ Resistors x5
- 100nF Caps x5
- PCB Prototype Board x2
- Soldering Iron
- Solder Wire
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items